*{
    margin: 0;
    padding: 0;    
}

.box2{
    float: left;
    border-right: 5px black solid;
    border-bottom: 5px black solid;
    height: 200px;
    width: 25%;
}

.box3{
    float: left;
    border-right: 5px black solid;
    border-bottom: 5px black solid;
    height: 200px;
    width: 49%;
}

.box4{
    float: right;
    /* border-right: 5px black solid; */
    border-bottom: 5px black solid;
    height: 200px;
    width: 25%;
    margin-right: 3px;

}